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> measure its volume and weight Except they'd have to measure its weight (mass), which is in... Kg...
by fragsworth 13y ago
> measure its volume and weight
Except they'd have to measure its weight (mass), which is in... Kg...
- emhs 13y agoWell, they're using the static, known density at 4 degrees Celsius to produce water with a known mass, and then test what the measurement of that mass comes to. Basically they're using a known mass of water as a calibration aid. But I don't know that this level of precision could compete with the efforts underway.
- EGreg 13y agoExactly. They'd COMPARE it to the existing physical object used as the reference for the kg. Assuming water allover the world hasnt changed its properties over the last few centuries they'd know whether it became heavier or lighter.